Spibey told Sky News: "I was just walking towards Las Ramblas with my boyfriend and there seemed to be some police there already.

"All of a sudden there was just real kind of chaos. People just started running and screaming.

"There was loud bangs and people just started running into shops.

"There was a mini stampede where we were down one of the alleyways.

"So we've just now been locked into a church.

A police source has said the driver of the van fled the vehicle on foot after crashing into a group of people.

Tom Gueller told the BBC: "I heard screams and a bit of a crash and then I just saw the crowd parting and this van going full pelt down the middle of the Ramblas and I immediately knew that it was a terrorist attack or something like that."

Australian Susan McLean she she saw "the panic and people running" and had now taken shelter in a shop around the corner.

To let all know we are safe in Barcelona. Saw the panic and people running. We were locked in a shop around the corner from Las Ramblas